How to Mix Concrete by Hand. Part of the series: How to Mix Concrete. Mix concrete by hand by pouring concrete into a wheel barrow and slowing adding water, mixing with a garden hoe until the right consistency is reached. Wear gloves and a mask to prevent damaging the skin, lungs or eyes, with advice from a landscape design artist in this free video on concrete. Read more: http://www.ehow.com/video_4951076_mix...